JPS59125326A - Combustion device - Google Patents

Abstract

PURPOSE:To detect a flame electric current despite the use of non-conductive combustion plate, by arranging such that a conductive member is wound around the outer periphery of container- like combustion plate so as to be in contact with the flame and a flame electric current sensor rod is disposed with a desired span apart from the conductive member. CONSTITUTION:A heater 7 is energized for preheating the wall of vaporizing cylinder 6 up to a temperature adequate for vaporizing a liquid fuel. Upon the completion of preheating, a blower 13 is driven for feeding an air through an air tube 11 and a static return tube 17 into a container 15 of constant oil level. A liquid fuel is fed into a needle 14 through an orifice tube 16 under the pressure P of air which is blown through the static return tube 17 into the container 15 of constant oil level. The liquid oil fed into the needle 14 is caused to vaporize inside the vaporizing cylinder 6 by combustion airs spouted from a nozzle 10. Heated and vaporizing fuel oil is spouted through a throttle orifice 8a throttle board 8 while mixing with a surrounding combustion air, and begins a red heat combustion over the entire surface of combustion plate 9. The flame enters into contact with a conductive metallic wire 24 wound around the outer periphery of combustion plate 9 and a sensor rod 25 provided above the metallic wire 24. It is possible under this condition to detect whether the liquid fuel is burnt properly by means of the metallic wire 24 energizing an area between the sensor rod 25 and the vaporizing cylinder 6 and a resultant flame.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device, and more particularly to a flame current detection device in a combustion device using a non-conductive combustion plate.

In a type of combustion device that mixes fuel and combustion air to form a mixed gas and combusts this mixed gas, a flame port is formed between the combustion plate and the vaporizer cylinder or in the combustion plate itself, and the flame is It is common to eject a mixed gas from the mouth for combustion. However.

In such a combustion device, the flame temperature is high (so NO
If a large amount of NOx is produced and the combustion equipment is an open type, the NOx will be released into the house.

This is not good for health, and if the combustion device is of a closed type, the NOx will be released outdoors and cause pollution.

For this reason, the combustion plate is formed from a sintered body without two ventilation holes, and is generally referred to as a flat plate-shaped Schbank plate, which has many small linear flame ports from the surface on the side of the mixing chamber to the outer surface. By increasing the contact area between the flame and the Schbank plate, the flame temperature can be lowered.
There are also those who plan to become lQx (known).

However, even in those using Schbank board,
There is a limit to how many small flame ports can be formed, so the IJOx is lower than those formed between the combustion plate and the carburetor tube.
However, the inventors proposed a method for reducing NOx by forming a porous sintered body by combustion.

However, depending on the sintered material, this new combustion plate is often a non-quaternary combustion plate, and in such cases, the conventional flame current detection device 1j-(conductive) is used. A device is used that detects the flame current in the combustion state by connecting a combustion plate with a tL characteristic to a grounded vaporizer cylinder, using the flame generated from the flame hole of this combustion plate to connect the sensor rod and the vaporizer cylinder. There were some flaws and flaws.

This invention was made to solve the above drawbacks.
A non-conductive container-shaped combustion plate with an opening on the side of the mixing window is disposed at the opening of the vaporization cylinder that forms the mixing chamber to mix fuel and combustion air, and the flame of this container-shaped combustion plate and A conductive member is wound around the outer periphery of the conductive member so as to be in contact with the flame current sensor rod, and a flame current sensor rod is disposed through the conductive member with a desired gap, and a voltage is applied between the sensor rod and the conductive member. The present invention aims to provide a combustion device that can enjoy and detect the combustion state as reliably as when using a conductive combustion plate, even if the combustion plate is non-conductive, by detecting the combustion state by applying an electric current. 1.

An embodiment of the present invention will be described below with reference to FIGS. 1-5.

In addition, this embodiment describes an embodiment in which a combustion device according to the present invention is incorporated into a hot air heater.

1'l'll, in Figures 4 and 5, (1) is a box with a warm air outlet (1A) at the upper front and an intake hole (1B) at the upper back, and (2) is a box. Intake hole of body (1) (
The blower installed in section 1B) blows indoor air through the intake hole (1B).
B), and blows air through the upper part of the box body (1) to the warm air outlet (1A) side. (3) is the combustion plate (9) of the combustor (5) in the thermal sintering device (A) to be described later, in other words, the transparent heat-resistant glass provided on the front part of the box body (11) facing the flame; A) is a combustion device built into the lower part of the box (1).

The detailed structure will be described later using FIGS. 1, 2, and 3. (4) is a hollow cylindrical reflector with a mirror-like inner surface provided to surround the combustion plate (9) of the combustion device (A);
The part facing the heat-resistant glass (3) is cut out.

A window portion (4A) is formed in this portion.

Figures 1, 2 and 3 show the detailed structure of the combustion device, and in Figure 7, (5) is a combustor, (6) is a cylindrical conductive vaporization tube forming a mixing chamber (6A), (7) is this vaporizer cylinder (
6) Preheating heater embedded in the wall, (8) is the vaporizer cylinder (
6) A diaphragm plate provided at the upper opening with a diaphragm hole (8A) in the center. (9) is the upper opening of the mixing chamber (6A).

That is, it is a substantially hollow conical combustion plate disposed at the upper opening of the carburetor (6), and includes the above-mentioned carburetor (6) and heater (7).

and a combustor (5) together with the aperture plate (8).

This combustion plate (9) was made by sintering silicon oxide particles or particles containing 69% or less of aluminum oxide using a binder. It is made of a non-conductive porous sintered body such as a hardened sponge, and does not have a linear flame port from the mixing chamber side surface to the outer surface like a conventional combustion plate such as a combustion plate. First, it exists in the sintered body itself. A labyrinth of extremely small ventilation holes that run intricately from the mixing chamber side surface to the outside surface are used as flame ports.

Furthermore, as shown in detail in FIGS. 2 and 3, this combustion plate (9) has an annular flange portion (9B) around the opening (9A).
) is integrally provided, and by pressing the 7 lamp part (9B) toward the vaporization tube (6) side with a conductive annular stop plate, the upper opening of the conductive vaporization tube (61) is sealed airtight. It is attached to this combustion plate (9).

As shown in FIG. 3, the conductive metal wire (241) is wound closely around the outer periphery of the base, and the screw (241) is attached to the vaporizing cylinder (6).
4A) and ground it, and this metal wire c
! Above the combustion plate (9), a sensor rod (c), which together with the metal wire constitutes a combustion state detection means, is provided at a position where the flame of the combustion plate (9) hits.

α0) is the vaporizer cylinder (6A) so that one end faces into the mixing chamber (6A).
6) Nozzle connected to the wall, (11) is this nozzle Q (
An air pipe connected to I, O2 is an air volume control valve provided in the middle of this air pipe O1l, O3 is a combustion air blower connected to air pipe αD, and O4 is a nozzle (provided coaxially within 11). one end is connected to the combustor (5) of nozzle 00.
) It faces into the mixing chamber (6A) through a side port, and the other end is connected to one end of an orifice pipe αe, which will be described later. +1
Reference numeral 51 denotes an oil level regulator for storing a predetermined amount of liquid fuel to be supplied to the combustor (5), and an oil reservoir is formed inside by a partition (15A). (One end of the 1-pulling force is immersed in the oil reservoir of the constant oil level device θ9, the other end is the orifice pipe connected to the needle α as described above, the α force is the static pressure return pipe, and one end is the constant oil level The other end is connected to the air pipe OD. The second end is the oil supply pipe, the second end is the oil level regulator (on the bottom of the IQ oil sump, and the other end is connected to the sub tank). It is connected to the bottom of u9. ■ is an electromagnetic pump for oil feeding installed in the middle of the oil feeding pipe, (21+ is an oil level regulator 05; The overflow pipe is connected to the oil supply pipe (the second one is the cartridge that holds the liquid fuel)
It is a tank and is placed on the sub-tank (+9).

The combustion device is configured as described above.

Next, the operation of this device will be described. First, a power switch (not shown) is turned on to energize the heater (7) and preheat the wall of the vaporizing cylinder (6) to a temperature necessary for vaporizing the liquid fuel. When preheating is complete, blower α3! Drive the air pipe OI
), and the static pressure return pipe θ force to blow air into the oil level regulator +151. The combustion air blown into the air pipe a0 is ejected into the mixing chamber (6A) through the nozzle 0. - The electromagnetic bomb ■ also drives, and the tank (from the 2nd line to the sub tank 9
The liquid fuel stored in the tank is passed through the oil pipe to the oil level regulator
Supply to the oil sump in (g). When the liquid fuel supplied to the oil reservoir of the oil level regulator α9 exceeds the height of the partition (15A), it overflows and flows into the overflow pipe CD.
The oil pipe returns to FJs through.

The fuel that is pumped up again by the electromagnetic pump and consumed during combustion, which will be described later, is supplied from the tank (■) to keep the oil level constant.

At this time, air is blown into the oil level regulator α9 through the static pressure return pipe 071, so the pressure (P
Apply pressure to the oil level and pour liquid fuel into the orifice pipe 00
is supplied to the needle side through. The liquid fuel supplied along the needle 0 is spouted from the nozzle [1], so it is atomized by the shear force of this air flow, mixed with the combustion air, and vaporized while spreading into a conical shape. Tube (
6) It collides with the inner wall and is vaporized.

The heated and vaporized liquid fuel collects in the throttle hole (8A) of the throttle plate (8) while mixing with the surrounding combustion air, and the mixture concentration is made uniform.
It is ejected from the throttle hole (8A), reaches the outer surface of the combustion plate (9) through the maze-like extremely small ventilation holes of the combustion plate (9), and is ignited by a predetermined ignition means, causing the entire combustion plate (9) to be ignited. The surface begins to burn red hot, enveloping this entire surface.

Then, the flame hits the coiled metal wire 04) on the outer periphery of the combustion plate (9), and contacts the sensor rod (c) above it. In this state, sensor rod L2■ and vaporizer cylinder (
When a voltage is applied between 6), a flame current flows through the metal wire Q0 and the flame, and it is possible to detect whether or not normal combustion is occurring.

Note that during this combustion, since the combustion plate (9) is configured as described above, the contact area between the combustion plate (9) and the flame is large.

It is significantly thicker than those using conventional Schbank plates, etc., and the flame temperature is lowered, resulting in significantly lower J and ○X. Also, since the combustion plate (9) becomes red hot due to combustion, a large amount of infrared rays will be emitted from the surface.

The apparatus according to the present invention operates as described above.
As shown in Figures 4 and 5, the heat generated by this combustion is blown out from the hot air outlet (1 person) by the air sent by the blower (2), and is also blown out from the reflector plate around the combustor (5). (4) and is emitted to the outside through the window (4A) of the reflector (4) and the transparent glass (3).

Heat the room.

Furthermore, although liquid fuel was used as the fuel in the above embodiments, it goes without saying that gas fuel may also be used.

As described above, according to the present invention, a non-conductive container-shaped combustion plate with an opening on the side of the mixing chamber is disposed at the opening of the vaporization cylinder forming the mixing chamber for mixing fuel and combustion air, and A conductive member is wound around the outer circumference of the container-shaped combustion plate so as to be in contact with the flame, and a flame current sensor rod is arranged with a desired gap between the conductive member and the conductive member. Since the combustion state is detected by applying a voltage between the combustion plate and the conductive member, even if the combustion plate is non-conductive, it is the same as when using a conductive combustion plate.

Combustion status can be reliably detected using flame current.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an apparatus according to an embodiment of the present invention, and FIG.
The figure is an enlarged sectional view of the combustor shown in Fig. 1, Fig. 3 is an exploded external view of the combustion plate, conductive metal wire, and sensor rod, and Fig. 4 is an arrangement according to an embodiment of the present invention. FIG. 5 is a front view showing the built-in hot air heater, and FIG. 5 is a cross-sectional view taken along the line -V in FIG. 4. Note that the same symbols in the figures indicate the same parts, and (5) is the combustor;
(6) is the carburetor cylinder, (6A) is the mixing chamber, (9) is the combustion plate, 041 is the metal wire, and (c) is the sensor rod. 1. Agent Makoto Kazuno - 1-. 2U ha $-? ρ *4- Required dormitory S color

Claims (1)

[Claims] (]+ A non-conductive container-shaped combustion plate with an opening on the side of the mixing chamber is disposed at the opening of the vaporization cylinder forming a mixing chamber for mixing fuel and combustion air, and this A conductive member is wound around the outer periphery of the container-shaped combustion plate so as to be in contact with the flame, and a flame current sensor rod is arranged at a desired gap (7) between the conductive part and the conductive part. The combustion device is characterized in that the combustion state is detected by applying a voltage between the combustion member and the combustion member. The combustion device according to claim 1, characterized in that the vaporizer tube is made of an electrically conductive material, and the conductive material is electrically connected to the conductive vaporizer tube. The noodle frying device according to claim 1 or 2, characterized in that the conductive member is wound around the outer circumference of the root of the container-shaped combustion plate. Claim 1, characterized in that
The combustion device according to any one of Clause 3. (5) The combustion device according to any one of Claims 1H and 4, wherein the container-shaped combustion plate is cone-shaped.